Myopia glasses for UK women is a concave lens. Erect a concave lens and the image is always smaller than the object, the virtual image, a concave lens is mainly used for correcting myopia. Myopia is mainly due to the lens deformation, resulting in a premature collection of light in front of the retina, a concave lens has a divergent light and concave lens into a narrow, upright, the virtual image, the image distance becomes longer, just fall on the retina.
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Cheap glasses degree: the refractive power of the lens is generally expressed in degrees. A equivalent to the average person or glasses shop about 100 degrees, that is, in the non Chinese state of D 1 (here’s Dioptre for the D rather than the degree of Degree). The more serious the problem of vision, the required degree of lens is deeper, the thickness of the lens will be higher.